FunctionHelper: fix renaming in lambdas if autogenerated name conflicts with the existing one

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamToLoop/afterCollectExtends.java

@@ -0,0 +1,24 @@
+// "Replace Stream API chain with loop" "true"
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+import java.util.stream.Collectors;
+
+public class Main {
+  public List<? extends CharSequence> getList() {
+    return Collections.emptyList();
+  }
+
+  private void collect() {
+      List<CharSequence> list = new ArrayList<>();
+      for (CharSequence charSequence : getList()) {
+          if (Objects.nonNull(charSequence)) {
+              list.add(charSequence);
+          }
+      }
+      List<? extends CharSequence> res = list;
+    System.out.println(res);
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamToLoop/beforeCollectExtends.java

@@ -0,0 +1,17 @@
+// "Replace Stream API chain with loop" "true"
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+import java.util.stream.Collectors;
+
+public class Main {
+  public List<? extends CharSequence> getList() {
+    return Collections.emptyList();
+  }
+
+  private void collect() {
+    List<? extends CharSequence> res = getList().stream().filter(Objects::nonNull).col<caret>lect(Collectors.toList());
+    System.out.println(res);
+  }
+}